Sink



FIG. 1 is a perspective view taken from the top, front, and right side of a sink showing my new design;

FIG. 2 is a top plan view of the sink shown in FIG. 1;

FIG. 3 is a bottom view of the sink shown in FIG. 1;

FIG. 4 is a front elevational view of the sink shown in FIG. 1;

FIG. 5 is a rear elevational view of the sink shown in FIG. 1;

FIG. 6 is a left elevational side view of the sink shown in FIG. 1; and,

FIG. 7 is a right elevational side view of the sink shown in FIG. 1.

The broken lines are for illustration purposes only and form no part of the claimed design. 

The ornamental design for a sink, as shown and described. 